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import pytest
import graphviz
DEFAULT_ENGINE = 'dot'
DEFAULT_FORMAT = 'pdf'
DEFAULT_JUPYTER_FORMAT = 'svg'
DEFAULT_JUPYTER_MIMETYPE = 'image/svg+xml'
def test_set_default_engine_invalid():
with pytest.raises(ValueError, match=r'unknown engine'):
graphviz.set_default_engine('nonengine')
def test_set_default_format_invalid():
with pytest.raises(ValueError, match=r'unknown format'):
graphviz.set_default_format('nonformat')
def test_set_default_engine(monkeypatch, *, engine='neato', explicit_engine='sfdp'):
assert len({DEFAULT_ENGINE, engine, explicit_engine}) == 3
from graphviz.parameters import Parameters
assert Parameters._engine == DEFAULT_ENGINE
# isolate the test
monkeypatch.setattr('graphviz.parameters.Parameters._engine', DEFAULT_ENGINE)
assert Parameters._engine == DEFAULT_ENGINE
g1 = graphviz.Graph()
assert g1.engine == DEFAULT_ENGINE
g2 = graphviz.Graph(engine=explicit_engine)
assert g2.engine == explicit_engine
old = graphviz.set_default_engine(engine)
assert old == DEFAULT_ENGINE
assert g1.engine == engine
assert g2.engine == explicit_engine
g3 = graphviz.Graph()
assert g3.engine == engine
g4 = graphviz.Graph(engine=explicit_engine)
assert g4.engine == explicit_engine
old = graphviz.set_default_engine(DEFAULT_ENGINE)
assert old == engine
assert g1.engine == DEFAULT_ENGINE
assert g2.engine == explicit_engine
assert g3.engine == DEFAULT_ENGINE
assert g4.engine == explicit_engine
def test_set_default_format(monkeypatch, *, format='png', explicit_format='jpeg'):
assert len({DEFAULT_FORMAT, format, explicit_format}) == 3
from graphviz.parameters import Parameters
assert Parameters._format == DEFAULT_FORMAT
# isolate the test
monkeypatch.setattr('graphviz.parameters.Parameters._format', DEFAULT_FORMAT)
assert Parameters._format == DEFAULT_FORMAT
g1 = graphviz.Graph()
assert g1.format == DEFAULT_FORMAT
g2 = graphviz.Graph(format=explicit_format)
assert g2.format == explicit_format
old = graphviz.set_default_format(format)
assert old == DEFAULT_FORMAT
assert g1.format == format
assert g2.format == explicit_format
g3 = graphviz.Graph()
assert g3.format == format
g4 = graphviz.Graph(format=explicit_format)
assert g4.format == explicit_format
old = graphviz.set_default_format(DEFAULT_FORMAT)
assert old == format
assert g1.format == DEFAULT_FORMAT
assert g2.format == explicit_format
assert g3.format == DEFAULT_FORMAT
assert g4.format == explicit_format
def test_set_jupyter_format(monkeypatch, *, jupyter_format='jpg',
expected_old_format='svg',
expected_normalized_format='jpeg',
expected_mimetype='image/jpeg'):
assert len({DEFAULT_JUPYTER_MIMETYPE, jupyter_format}) == 2
from graphviz import jupyter_integration
assert (jupyter_integration.JupyterIntegration._jupyter_mimetype
== DEFAULT_JUPYTER_MIMETYPE)
# isolate the test
monkeypatch.setattr('graphviz.jupyter_integration.JupyterIntegration._jupyter_mimetype',
DEFAULT_JUPYTER_MIMETYPE)
assert (jupyter_integration.JupyterIntegration._jupyter_mimetype
== DEFAULT_JUPYTER_MIMETYPE)
g1 = graphviz.Graph()
assert g1._jupyter_mimetype == DEFAULT_JUPYTER_MIMETYPE
old = graphviz.set_jupyter_format(jupyter_format)
assert old == jupyter_integration.DEFAULT_JUPYTER_FORMAT
assert g1._jupyter_mimetype == expected_mimetype
g2 = graphviz.Graph()
assert g2._jupyter_mimetype == expected_mimetype
old = graphviz.set_jupyter_format(DEFAULT_JUPYTER_FORMAT)
assert old == expected_normalized_format
assert g1._jupyter_mimetype == DEFAULT_JUPYTER_MIMETYPE
assert g2._jupyter_mimetype == DEFAULT_JUPYTER_MIMETYPE
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